EVAL-ADE7754EBZ【PDF 1/44 页】BOARD EVALAUTION FOR ADE7754

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Polyphase Multifunction

Energy Metering IC with Serial Port

ADE7754

FEATURES

High Accuracy, Supports IEC 687/61036

Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire

and any Type of 3-Phase Services

Less than 0.1% Error in Active Power Measurement over a

Dynamic Range of 1000 to 1

Supplies Active Energy, Apparent Energy, Voltage RMS,

Current RMS, and Sampled Waveform Data

Digital Power, Phase, and Input Offset Calibration

On-Chip Temperature Sensor ( 4 C Typical after Calibration)

On-Chip User Programmable Thresholds for Line Voltage

SAG and Overdrive Detections

SPI Compatible Serial Interface with Interrupt

Request Line (IRQ)

Pulse Output with Programmable Frequency

Proprietary ADCs and DSP Provide High Accuracy over

Large Variations in Environmental Conditions and Time

Single 5 V Supply

GENERAL DESCRIPTION

The ADE7754 is a high accuracy polyphase electrical energy

measurement IC with a serial interface and a pulse output. The

ADE7754 incorporates second order Σ - ? ADCs, reference

circuitry, temperature sensor, and all the signal processing

required to perform active, apparent energy measurements, and

rms calculation.

The ADE7754 provides different solutions for measuring active

the use of the ADE7754 in various power meter services such as

3-phase/4-wire, 3-phase/3-wire, and 4-wire delta.

In addition to rms calculation, active and apparent power infor-

mation, the ADE7754 provides system calibration features for

each phase (i.e., channel offset correction, phase calibration,

and gain calibration). The CF logic output provides instanta-

neous active power information.

The ADE7754 has a waveform sample register that enables

access to ADC outputs. The part also incorporates a detection

circuit for short duration low or high voltage variations. The

voltage threshold levels and the duration (number of half line

cycles) of the variation are user programmable.

A zero-crossing detection is synchronized with the zero-crossing

point of the line voltage of each of the three phases. The infor-

mation collected is used to measure each line’s period. It is also

used internally to the chip in the line active energy and line

apparent energy accumulation modes. This permits faster and

more accurate calibration of the power calculations. This signal

is also useful for synchronization of relay switching.

Data is read from the ADE7754 via the SPI serial interface. The

interrupt request output ( IRQ ) is an open-drain, active low

logic output. The IRQ output goes active low when one or more

interrupt events have occurred in the ADE7754. A status regis-

ter indicates the nature of the interrupt.

The ADE7754 is available in a 24-lead SOIC package.

and apparent energy from the six analog inputs, thus enabling

FUNCTIONAL BLOCK DIAGRAM

RESET

AV DD

AVGAIN

X 2

AVRMSOS

AVAG

POWER SUPPLY

ADE7754

I AP

I AN

PGA1

PGA2

ADC

AAPGAIN HPF

X 2

AIRMSOS

LPF2

|X|

MONITOR

V AP

ADC

APHCAL

AAPOS

AWG

ABS

BVGAIN

BVRMSOS

I BP

I BN

PGA1

PGA2

ADC

BAPGAIN HPF

X 2

BIRMSOS

LPF2

BVAG

|X|

DFC

CFNUM

V BP

ADC

BPHCAL

BAPOS

BWG

ABS

CVGAIN

X 2

CVRMSOS

CVAG

CFDEN

DV DD

DGND

I CP

I CN

PGA1

PGA2

ADC

CAPGAIN HPF

X 2

CIRMSOS

LPF2

|X|

WDIV

VADIV

CLKIN

CLKOUT

V CP

V N

2.4V REF

ADC

CPHCAL

CAPOS

CWG

TEMP

SENSOR

ABS

ADC

ADE7754 REGISTERS AND

SERIAL INTERFACE

AGND

REF IN/OUT

DIN DOUT SCLK

IRQ

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 www.analog.com

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